Question

Choose the correct statement regarding projectile motion in the absence of air resistance. Assume the object is at sea level moving from left to right.
The magnitude of the acceleration in the x direction is always zero.
At the apex, in the y direction, the velocity is zero and the acceleration is positive.
At the apex, in the x direction, the velocity is zero and the acceleration is zero.
The magnitude of the velocity in the y direction is always constant.
At the apex, in the y direction, the velocity is negative and the acceleration is zero.

Answer 1

Answer:

Explanation:

The magnitude of the acceleration in the x direction is always zero: TRUE.

At the apex, in the y direction the velocity is zero and the accelration is positive. TRUE.

At the apex, in the x direction, the velocity is zero and the acceleration is zero. FALSE. The accelration is zero, but the velocity is the same it had when it was shot.

The magnitude of the velocity in the y direction is always constant. FALSE, it's subject to gravity and it's velocity varies as $v=v_0 - 9.81ms^{-2} t$

At the apex, in the Y direction, the velocity is negative and the acceleration is zero. FALSE. Velocity is zero, Acceleration is $9.81 ms^{-2}$, towards the negative y axis